This is what it says on the King College Cambridge website:-
^Are you inclined towards essay subjects (the arts or social sciences).
If you think that you would like to study an arts or social sciences course at university but you are not sure which one, then English Literature, History, languages and Mathematics are good keystone subjects: choosing one or more of these will provide a good foundation for your subject combination.
Other good choices to combine these subjects with include: an additional language, Ancient History, Classical Civilisation, Economics, Further Mathematics, Geography, Philosophy, Religious Studies, and sciences (Biology, Chemistry or Physics).
For many (but not all) arts and social sciences courses, there is no required set of subjects.
Other possible subject choices, for instance Archaeology, Citizenship, English Language, Environmental Science, Government and Politics, History of Art, Law, Music, Psychology, or Sociology, as useful preparation for some of our arts and social sciences courses.^
So from this I would say - history - brilliant choice, biology and RS - decent choices, politics and psychology - fine but maybe not both.